remove references to Dev Environments feature

Signed-off-by: Guillaume Lours <705411+glours@users.noreply.github.com>

nginx-flask-mysql/.docker/docker-compose.yaml

@@ -1,61 +0,0 @@
-services:
-  db:
-    image: mariadb:10-focal
-    command: '--default-authentication-plugin=mysql_native_password'
-    restart: always
-    healthcheck:
-      test: ["CMD", "mysqladmin", "ping", "-h", "127.0.0.1", "--silent"]
-      interval: 3s
-      retries: 5
-      start_period: 30s
-    secrets:
-      - db-password
-    volumes:
-      - db-data:/var/lib/mysql
-    networks:
-      - backnet
-    environment:
-      - MYSQL_DATABASE=example
-      - MYSQL_ROOT_PASSWORD_FILE=/run/secrets/db-password
-    expose:
-      - 3306
-      - 33060
-
-  backend:
-    build:
-      context: backend
-      target: dev-envs
-    restart: always
-    volumes:
-      - /var/run/docker.sock:/var/run/docker.sock
-    secrets:
-      - db-password
-    ports:
-      - 8000:8000
-    networks:
-      - backnet
-      - frontnet
-    depends_on:
-      db:
-        condition: service_healthy
-
-  proxy:
-    build: proxy
-    restart: always
-    ports:
-      - 80:80
-    depends_on: 
-      - backend
-    networks:
-      - frontnet
-
-volumes:
-  db-data:
-
-secrets:
-  db-password:
-    file: db/password.txt
-
-networks:
-  backnet:
-  frontnet:

nginx-flask-mysql/README.md

@@ -1,11 +1,4 @@
 ## Compose sample application
-
-### Use with Docker Development Environments
-
-You can open this sample in the Dev Environments feature of Docker Desktop version 4.12 or later.
-
-[Open in Docker Dev Environments <img src="../open_in_new.svg" alt="Open in Docker Dev Environments" align="top"/>](https://open.docker.com/dashboard/dev-envs?url=https://github.com/docker/awesome-compose/tree/master/nginx-flask-mysql)
-
 ### Python/Flask with Nginx proxy and MySQL database
 
 Project structure: